how to plot waterfall FFT

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Gaurav Bhakar
Gaurav Bhakar 2015-4-18
评论： Star Strider 2015-4-19
I have time and force discrete values and want a waterfall plot(time, frequency and amplitude). so how can i do that. is these 2 inputs are sufficient for plotting

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回答（2 个）

pfb
pfb 2015-4-18
have you taken a look at the documentation of the "waterfall" function? You can do that by typing
doc waterfall
I'm not sure why you say you have 2 inputs (time, frequency and amplitude add to 3, in my book).
Anyway waterfall works with either 1 (matrix) or 3 basic inputs.
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Gaurav Bhakar
Gaurav Bhakar 2015-4-19
i have seen that doc file... i have 50000 time and force values and i want to show 3-d plotting having time , frequency and amplitude as 3 axis. that is possible by using "window". but i dont know how to do that. if you have any code if will be very help full for completing my college report.
by the way thanks for response

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Star Strider
Star Strider 2015-4-18
Use the spectrogram function to create a time-frequency representation of your force data. Then you can use the waterfall plot. Otherwise, with only time or frequency and force, you do not have enough data for a waterfall plot. You can only plot a 2D fft.
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Gaurav Bhakar
Gaurav Bhakar 2015-4-19
thanks but by any means if i can give "window" to my data and use hold on command. will it work
Star Strider
Star Strider 2015-4-19
See the documentation for the spectrogram function (Signal Processing Toolbox). It has a default window function, and allows you to choose from a library of others. With spectrogram, you would not need to use the hold function, unless you are plotting something on top of the plot.

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